Neutron dosimetry in linear electron accelerator during radiotherapy treatment: simulation and experiment

Claudio Manfredotti; U. Nastasi; C. Ongaro; E. Stasi; Alessandro Zanini

doi:10.1117/12.204162

3 March 1995 Neutron dosimetry in linear electron accelerator during radiotherapy treatment: simulation and experiment

Claudio Manfredotti, U. Nastasi, C. Ongaro, E. Stasi, Alessandro Zanini

Proceedings Volume 2339, International Conference on Neutrons and Their Applications; (1995) https://doi.org/10.1117/12.204162
Event: 4th International Conference on Applications of Nuclear Techniques: Neutrons and their Applications, 1994, Crete, Greece

Abstract

In the electron linear accelerators used for radiotherapy by high energy electrons or gamma rays, there is a non negligible production of neutrons by photodisintegration or electrodisintegration reactions on the high Z components of the head machine (target, flattening filter, collimators). At the Experimental Physics Department of Torino University, Torino, Italy an experimental and theoretical evaluation has been performed on the undesired neutron production in the MD Class Mevatron Siemens accelerator used at the Radiotherapy Department of S. Giovanni Battista A.S. Hospital for cancer therapy by a 15 MV gamma ray beam. A simulation of the total process has been carried out, using EGS4 MonteCarlo computer code for the evaluation of photoneutron spectra and MCNP code for the neutron transport in the patient's body. The geometrical description both of the accelerator head in EGS4 and of the anthropomorphous phantom in MCNP have been highly optimized. Experimental measurements have been carried out by bubble detectors BD 100R appropriately allocated inside a new phantom in polyetylene and plexiglass, especially designed for this purpose.

Citation Download Citation

Claudio Manfredotti, U. Nastasi, C. Ongaro, E. Stasi, and Alessandro Zanini "Neutron dosimetry in linear electron accelerator during radiotherapy treatment: simulation and experiment", Proc. SPIE 2339, International Conference on Neutrons and Their Applications, (3 March 1995); https://doi.org/10.1117/12.204162

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